Perl local() function unuseful for Coro threads.
This module uses tie magick to make scalar local for each Coro thread.
Unlike Coro::Specific this module destroys all data attached to coroutine when coroutine gets destroyed.
It's useful when you need to call destructors of coroutine local objects when coroutine destroyed.
And you can easily localize value of hash with this module.
It has an overhead of calling one callback per localized variable when coroutine is destroyed.